Volume 118, Number 6, June 2017
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||01 September 2017|
Critical switching fluence of L10-FePt nanoparticles with practical size to ultrafast all-optical polarization switching
1 Wuhan National Laboratory of Optoelectronics, Huazhong University of Science & Technology Wuhan, 430074, China
2 School of Optical and Electronic Information, Huazhong University of Science & Technology Wuhan, 430074, China
Received: 18 May 2017
Accepted: 2 August 2017
The magnetic storage industry will be pushed into a new era by emerging magnetic materials and ingenious read/write techniques. Recently, L10-FePt nanoparticles with exceptionally high uniaxial anisotropy, combined with the technique of all-optical magnetic switching, have increasingly drawn the attention of researchers. Focusing on L10-FePt nanoparticles, we report the superparamagnetic size limits and three elaborate stages of magnetic orientation switching, which demonstrate that in terms of the opto-magnetic responses of L10-FePt nanoparticles with the size of 6 nm, the fluence of an ultrashort laser pulse should not be larger than the level of 40 mJ/cm2 in order to achieve the helicity-dependent all-optical switching.
PACS: 75.40.Gb – Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.) / 75.50.Ss – Magnetic recording materials / 75.50.Bb – Fe and its alloys
© EPLA, 2017
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